antigenic variation

antigenic variation

[‚an·tə¦jen·ik ‚ver·ē′ā·shən]
(immunology)
Alteration of an antigen on the surface of a microorganism; may enable a pathogenic mocroorganism to evade destruction by the host's immune system.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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